An enzyme that catalyzes the transfer of acetyl groups from ACETYL-COA to arylamines. It can also catalyze acetyl transfer between arylamines without coenzyme a and has a wide specificity for aromatic amines, including serotonin. However, arylamine n-acetyltransferase should not be confused with the enzyme arylalkylamine n-acetyltransferase which is also referred to as serotonin ACETYLTRANSFERASE.